A small subdivision is one association running one budget under one set of rules. A large phased development is something else entirely. It is several communities, built and sold over years, that have to share major infrastructure while each keeps its own identity and its own costs. That is what master and sub-associations are for, and getting the structure right early is far easier than untangling it under pressure later.

Why phased communities need layered governance

Picture a development with a townhome section, a single-family section, and a condominium building, all sharing a main entrance, a central park, and a private road network. Those three sections have almost nothing in common at the unit level. The condo owners care about the building envelope and the elevators. The townhome owners care about shared walls and exterior maintenance. The single-family owners care about their own roofs and yards.

But all three share the entrance, the park, and the roads. You cannot run that with one budget, because the costs are wildly different per section and lumping them together is unfair to everyone. And you cannot run it with three independent associations, because nobody would be responsible for the shared infrastructure they all depend on. The answer is a layer. A master association owns and runs the shared elements. Sub-associations under it run what belongs to each section.

Master versus sub: budgets and documents

The two layers are not just an org chart. They are two separate governance and financial structures, each with its own scope.

The master association

• Owns and maintains the shared infrastructure: main entrances, arterial roads, central amenities, perimeter landscaping, shared stormwater systems.
• Runs a master budget funded by an assessment that every home in the community pays, usually through its sub-association.
• Operates under master CC&Rs that bind the whole community and set the rules for the shared elements.
• Carries its own reserve for the shared components it will eventually have to replace.

The sub-association

• Owns and maintains only what belongs to its section: shared walls, section-specific amenities, the things unique to that product type.
• Runs its own budget funded by its own assessment, on top of the master assessment.
• Operates under its own supplemental CC&Rs that apply only to that section and sit beneath the master documents.
• Carries its own reserve for its own components.

A homeowner in this structure typically pays two assessments, one to the master and one to their sub, and lives under two layers of rules. That is not redundancy. It is the price of a community where shared and private costs are kept honestly separate. The reserve discipline applies at both layers, which is why it is worth understanding in its own right, covered in HOA reserve funds explained.

Cost allocation between phases

The hardest question in a phased community is who pays for what, and when. The shared infrastructure usually gets built early, before most of the homes exist. The central park and the main road serve a community of a thousand homes, but in year one there are only fifty homes to pay for them. If you simply divide the master budget by the homes that exist today, the first buyers carry a crushing share of a cost meant for everyone.

This is where builders get into trouble, and where the structure has to be deliberate. A few principles keep the allocation fair across phases.

• Allocate the master assessment by a logical, documented basis, whether that is per home, by product type, or by a weighting written into the master CC&Rs.
• Decide explicitly how shared costs are covered before the full community exists, and disclose it, rather than letting early buyers silently absorb a share meant for homes not yet built.
• Bring each phase into the master assessment as it closes, so the cost base grows with the community rather than resting on the first owners.
• Keep the master reserve funded across the whole build, so the eventual replacement of shared infrastructure is not dumped on whichever phase happens to be holding the keys when it fails.

Get this wrong and the unfairness compounds. Early buyers feel gouged, late buyers feel subsidized, and the homeowner boards inherit a cost-sharing fight that the documents never resolved.

Common mistakes

• Building the shared infrastructure into a single flat association and trying to layer the governance in later. The structure has to be in the recorded documents from the start.
• Writing master and sub CC&Rs that contradict each other, so a rule at one layer cancels a rule at the other and nobody knows which governs.
• Leaving cost allocation between phases vague, so the basis for who pays what is a matter of interpretation instead of a documented formula.
• Underfunding the master reserve because the shared assets are new, then handing a thousand homes a shared-infrastructure replacement with nothing saved against it.
• Turning over the sub-associations and the master on different timelines without a plan, so control of the shared elements is ambiguous during the handoff.
• Treating the master association as an afterthought, when it owns the most expensive and most visible parts of the entire community.

Why the structure is worth the effort

Layered governance looks like complexity, and it is. But the complexity is real whether or not you account for it. A phased community genuinely has shared costs and private costs, early buyers and late buyers, common infrastructure and section-specific assets. The master and sub-association structure is just an honest accounting of a community that is genuinely more than one thing.

The builders who handle this well set the structure up before the first phase closes, write master and sub documents that fit together, and allocate costs on a basis they can defend to every buyer in every phase. The ones who handle it badly improvise as they go and leave the homeowner boards to untangle it. Phased development is a core part of how larger builders work, and it runs through everything on the builder side of Vestra. The full picture of operating an association across its life sits in the complete guide to HOA management for homebuilders.